1 [astronomy] The great circle formed by the intersection of the plane of the earth’s orbit around the sun (or apparent orbit of the sun around the earth) and the celestial sphere.
2 [astronomy] The mean plane of the earth’s orbit around the sun.
1 [astronomy] The great circle formed by the intersection of the plane of the earth’s orbit around the sun (or apparent orbit of the sun around the earth) and the celestial sphere.
2 [astronomy] The mean plane of the earth’s orbit around the sun.